Specimen Stability

Reference Values

Acetaminophen concentrations >150 µg/mL at 4-hours
after ingestion and >50 µg/mL at 12-hours after ingestion
are often associated with toxic reactions.

Note: Therapeutic acetaminophen
concentrations vary significantly depending on the individual
patient. A range of 10 µg/mL to 30 µg/mL may
be an effective specimen concentration for many patients; however,
some individuals are best treated at concentrations outside this
range. The physician must determine the appropriate therapeutic
range for each patient.